Fish is widely considered one of the healthiest foods in the human diet. It provides high-quality protein, essential vitamins, and omega-3 fatty acids that support heart and brain function. Because of this, it is often recommended as part of a balanced diet.
However, not all fish are completely free from hidden concerns. Some popular fish species can contain small amounts of environmental contaminants that accumulate over time.
These substances usually come from pollution in oceans and rivers. They enter the food chain and slowly build up as smaller fish are eaten by larger predators.
As a result, certain fish—especially those higher in the food chain—can contain trace levels of mercury and other compounds. The levels vary depending on where and how the fish is caught or farmed.
